/**
 * Copyright [2012-2013] [Guðmundur Björn Birkisson]
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. Copyright [2012-2013] [Guðmundur Björn Birkisson]
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * ---------------------------------------------------------------------------
 * 
 * Class name:  RDActivationRecordCounter
 * 
 * Description of class:
 * 
 * Helper class to handle ar counter for morpho VM
 * 
 */

package karel.lang.newParserTools;

public class RDActivationRecordCounter {

    private static RDActivationRecordCounter instance; 
    
    private int count;
    
    public static RDActivationRecordCounter getInstance() {
        if(instance==null) {
            instance = new RDActivationRecordCounter();
        }
        return instance;
    }
    
    public static void reset() {
        instance = null;
    }

    private RDActivationRecordCounter() {
        count = -1;
    }
    
    public int inc() {
        return ++count;
    }
    
    public int dec() {
        return count--;
    }
}
